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High-Throughput Fabrication of Anti-Counterfeiting Nanopillar-Based Quick Response (QR) Codes Using Nanoimprint Lithography
Analytical Letters ( IF 2 ) Pub Date : 2020-05-20 , DOI: 10.1080/00032719.2020.1769123
Alia Colniță 1 , Daniel Marconi 1 , Ioana Brezeștean 1, 2 , Roxana-Diana Pașca 1 , Irina Kacso 1 , Lucian Barbu-Tudoran 1, 3 , Ioan Turcu 1
Affiliation  

Abstract Quick response (QR) codes are two-dimensional optical labels which store information instantly readable by an imaging device (smartphone camera). They can be used as anti-counterfeiting elements to help companies and consumers identify the authenticity/traceability of the products. Three-dimensional nanostructured QR codes are a new class of increased level of security labels to better support product authentication. In this work, nanoimprint lithography (NIL) was used to fabricate flexible, high resolution three-dimensional (3D) QR codes with selective and reflective properties, suitable as anti-counterfeiting elements. The original design and the optical properties of the fabricated label are given by a bicolor pattern, where one color is diffractively generated by a set of 300 nm pitch nanopillars and the second color arise from a set of 400 nm pitch nanopillars, together comprised in the shape of a nanostructured based QR code. The glass transition temperature (Tg ) of the flexible and transparent imprinted substrate (Intermediate Polymer Substrates – IPS) was assessed by differential scanning analysis (DSC). Scanning electron microscopy (SEM) images were used to optimize the NIL imprinting parameters. Optimal individual nanopillars with straight sidewalls were visualized when the imprinting temperature was slowly decreased and a constant imprinting pressure was maintained constant throughout the imprinting process. A good replication of the mold in the thermoplastic substrate is of key importance to an accurate reading of the label.

中文翻译:

使用纳米压印光刻技术高通量制造基于纳米柱的防伪快速响应 (QR) 码

摘要 快速响应 (QR) 码是二维光学标签,可存储可由成像设备(智能手机相机)即时读取的信息。它们可以作为防伪元素,帮助企业和消费者识别产品的真实性/可追溯性。三维纳米结构二维码是一类新的安全标签,可更好地支持产品认证。在这项工作中,纳米压印光刻 (NIL) 用于制造具有选择性和反射特性的灵活、高分辨率三维 (3D) 二维码,适合用作防伪元件。制造标签的原始设计和光学特性由双色图案给出,其中一种颜色是由一组 300 nm 间距的纳米柱衍射产生的,第二种颜色来自一组 400 nm 间距的纳米柱,它们一起包含在基于纳米结构的二维码的形状中。通过差示扫描分析 (DSC) 评估柔性透明压印基板(中间聚合物基板 – IPS)的玻璃化转变温度 (Tg)。扫描电子显微镜 (SEM) 图像用于优化 NIL 压印参数。当压印温度缓慢降低并且在整个压印过程中保持恒定的压印压力时,可以看到具有直侧壁的最佳单个纳米柱。模具在热塑性基材中的良好复制对于准确读取标签至关重要。一起包含在基于纳米结构的二维码的形状中。通过差示扫描分析 (DSC) 评估柔性透明压印基板(中间聚合物基板 – IPS)的玻璃化转变温度 (Tg)。扫描电子显微镜 (SEM) 图像用于优化 NIL 压印参数。当压印温度缓慢降低并且在整个压印过程中保持恒定的压印压力时,可以看到具有直侧壁的最佳单个纳米柱。模具在热塑性基材中的良好复制对于准确读取标签至关重要。一起包含在基于纳米结构的二维码的形状中。通过差示扫描分析 (DSC) 评估柔性透明压印基板(中间聚合物基板 – IPS)的玻璃化转变温度 (Tg)。扫描电子显微镜 (SEM) 图像用于优化 NIL 压印参数。当压印温度缓慢降低并且在整个压印过程中保持恒定的压印压力时,可以看到具有直侧壁的最佳单个纳米柱。模具在热塑性基材中的良好复制对于准确读取标签至关重要。通过差示扫描分析 (DSC) 评估柔性透明压印基板(中间聚合物基板 – IPS)的玻璃化转变温度 (Tg)。扫描电子显微镜 (SEM) 图像用于优化 NIL 压印参数。当压印温度缓慢降低并且在整个压印过程中保持恒定的压印压力时,可以看到具有直侧壁的最佳单个纳米柱。模具在热塑性基材中的良好复制对于准确读取标签至关重要。通过差示扫描分析 (DSC) 评估柔性透明压印基板(中间聚合物基板 – IPS)的玻璃化转变温度 (Tg)。扫描电子显微镜 (SEM) 图像用于优化 NIL 压印参数。当压印温度缓慢降低并且在整个压印过程中保持恒定的压印压力时,可以看到具有直侧壁的最佳单个纳米柱。模具在热塑性基材中的良好复制对于准确读取标签至关重要。当压印温度缓慢降低并且在整个压印过程中保持恒定的压印压力时,可以看到具有直侧壁的最佳单个纳米柱。模具在热塑性基材中的良好复制对于准确读取标签至关重要。当压印温度缓慢降低并且在整个压印过程中保持恒定的压印压力时,可以看到具有直侧壁的最佳单个纳米柱。模具在热塑性基材中的良好复制对于准确读取标签至关重要。
更新日期:2020-05-20
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